Just received new M1 unit from Amazon. Installed M1 with Tivo Roamio. All remote functions work but constant banding on video and loud humming on audio with phone, tablets, or desktop, both on local network and remotely. Have tried resets. Network bandwidth consitstently 5Mb up, all other devices on network function well, so I don't think that is the problem. Have others seem these symptoms? Could I have a bum unit?